S26·E1 I.O.U

When troubled gambler Nick Williams is murdered at a greyhound track it seems at first that his huge debts cost him his life. The team delve deeper and find an embittered wife, a disgruntled local ruffian and a greyhound handler with secrets of his own. Is there more to Nick's past than the team yet know? Their investigation takes in race fixing and sex tapes, and things get really complicated when one of the suspects is also killed. The detectives must race to find the culprit before the father of the dead suspect takes the law into his own hands.